* Glazing: During the manufacturing process, a thin glaze can form on the brake pads. This glaze needs to be broken in before the pads make proper contact with the rotors. This is the most common reason for new brake squeal.
* Contamination: Dust, oil, or other contaminants on the brake rotors or pads can interfere with proper contact and cause squealing.
* Hardware: The brake caliper hardware (pins, clips, etc.) might be rusty, dirty, or improperly lubricated. This can cause the brake pads to vibrate and squeak.
* Pad Material: Some pad materials are inherently more prone to squealing than others. Higher-performance pads, for example, sometimes have a higher squeal tendency.
* Rotor Variation: If the brake rotor isn't perfectly smooth or has minor imperfections, it can contribute to squealing.
* Improper Installation: If the brakes weren't installed correctly, it could lead to uneven pad contact and squealing.
The squealing usually subsides after a break-in period of several hundred miles as the glaze wears off and the pads bed in. However, if the squealing persists or is exceptionally loud, it's important to have a mechanic inspect the brakes to rule out any underlying issues.
